Exercise 4 Exercise 4A copper wire of diameter D = 1mm is crossed by an intensity of 2A. knowingthat the electron concentration is 8.45x1028 m-3, determine the rate at which theelectrons are drawn. It is assumed that the wire is 2.5 m long and that it issubjected to a potential difference of 0.1 V. Then calculate the mobility of theelectrons and deduce the conductivity of the wire.Exercise 5We consider a germanium crystal of type P, resistivity 0.01 2. cm at 27 °C. Werecall that for such a temperature, the intrinsic concentration is given by thelaw n₁ = AT³/² exp(-), with A = 10²2. The mobility of the holes is then0.17 S.I. Recall that k = 1.38x10-23 S.I.1. Calculate the hole concentration;2. Deduce the concentration of free electrons3. Repeat the calculations of questions a) and b) for a germanium crystalwith resistivity 10.0 2. cm.Exercise 6Evaluate the density of charge carriers in intrinsic silicon at 300 K. We giveEg = 1.12eV, mi = 0.98m, m = 0.19m, min = 0.16m, mhh = 0.49m. Knowing thatme = (6) 2/3 (mim²) ¹/3, mi(mi2/2 + m3/2)2/3 and+3/23/43/4- (2.5 (³)n₁ =2K)) 10Eg3/2Т(T)³7² exp(-2KBT)1019 cm-3.Calculate the concentration of charge carriers at T = 300 K in silicon dopedwith 1016 arsenic atoms per cm³ if n = 1.45x10¹0 cm-³.

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A copper wire of diameter D = 1mm is crossed by an intensity of 2A. knowing that the electron concentration is 8.45x1028 m-3, determine the rate at which the electrons are drawn. It is assumed that the wire is 2.5 m long and that it is subjected to a potential difference of 0.1 V. Then calculate the mobility of the electrons and deduce the conductivity of the wire.

A copper wire of diameter D = 1mm is crossed by an intensity of 2A. knowing that the electron concentration is 8.45x1028 m-3, determine the rate at which the electrons are drawn. It is assumed that the wire is 2.5 m long and that it is subjected to a potential difference of 0.1 V. Then calculate the mobility of the electrons and deduce the conductivity of the wire.

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter12: Electronic Control Devices

Section: Chapter Questions

Problem 14RQ

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